A hypothetical bat species (species 1) lives in a city. Another hypothetical bat species (species 2) established a population in the same city after a number of individuals escaped from a zoo. In isolation, each species prefers to roost in buildings that are three or more stories tall.

After bat species 2 becomes established in the city, you observe that bat species 1 is only found roosting at the top of short buildings that are less than 3 stories tall, while bat species 2 roots only at the top of building that are three or more stories tall.
Roosting areas in buildings of any height are the _________________ of both bat species.
A. adaptation
B. fundamental niche
C. resource partitioning
D. realized niche
E. competitive exclusion

Niche is the role played by an organism that how they can live in an environment including their diet and shelter
Fundamental niche represents all the environmental conditions where a species is able to live or can live
There is no ecological barriers in case of this type of niche
Since both bat species 1 and 2 can roost in buildings of any height this means there is no ecological barrier and heights of building represent all the conditions where bat species can live so it clearly represents fundamental niche